gamepad: Add initial controller navigation (#406)

Co-authored-by: kramo <git@kramo.page>
Co-authored-by: Zoey Ahmed <zoethetransrat@gmail.com>
Reviewed-on: https://codeberg.org/kramo/cartridges/pulls/406
Reviewed-by: Laura Kramolis <git@kramo.page>
Reviewed-by: Jamie Gravendeel <me@jamie.garden>
Co-authored-by: Zoey Ahmed <zoeyahmed10@proton.me>
Co-committed-by: Zoey Ahmed <zoeyahmed10@proton.me>

cartridges/meson.build

@@ -1,5 +1,11 @@
 python.install_sources(
-    files('__init__.py', '__main__.py', 'application.py', 'games.py'),
+    files(
+        '__init__.py',
+        '__main__.py',
+        'application.py',
+        'games.py',
+        'gamepads.py',
+    ),
     subdir: 'cartridges',
 )